Power tool



M. H. LUNA Dec. 1,1942.

POWER TOOL Filed May 16, 194] Patented Dec. l, 1.942

f rowsa 'rooL Marcos H. Luna, San Gabriel, Calif.. assigner to Esaick Machinery Company, Lol Angeles, Calif., a partnership composed of Newman Eslick and Bryant Essick Application May 16, 1941, Serial No. 393,781

Claims.

'I'hls invention relates to-tools and relates more particularly to manually manipulated power driven tools. A general object of this invention y is to provide a simple, practical and effective tool of this character operable to successively perform a plurality of operations differing in character without alteration and without transferring or exchanging the bits, drills, counter-drills, riveting heads or other instrumentalities employed in the operations.

In many cases where power driven hand tools are used it is necessary to have two or more such tools at hand in order to expedite the performance of successive operations. For example, where a plurality of vopenings, are to be drilled and then counter-bored, it is necessary to have one power tool for drilling the openings and another power tool for counter-boring the openings, one tool being equipped with a drill and the other being equipped with a counter-drill. Because of the difllcuity that a single operator encounters in handling the two tools and their power carrying wires, it is usually found necessary to have an operator for each of the power tools.

Another object of this invention is to provide a compact, readily handled and manipulated power tool adapted to perform a plurality of operations, diifering in character, in rapid succession without exchanging the drills or. other im plements used in .suchV operations.

Another object of this invention is to provide a power tool of the character referred to that may be easily and expertly handled by a single operator. The powertool of the present invention is such that its single operator may readily perform thesuccessive dissimilar operations that heretofore have required two tools and usually two operators.

Another object of this invention is to provide a power tool of the character refered to that is such that the operator may quickly perform the successive operations with the different drills, or the like, without appreciably altering the position of the tool.

Another object of this invention is to provide a power tool of the character mentioned embodying a multiple chuck or head for carrying the different bits, drills, reamers, countersinks, or the like, and supported to be readily moved from one position to the other for the successive use of the various drills, etc.

Another object ofA this invention is to provide a power tool of the character mentioned in which the bits, drills, etc. of the head are normally idle and undriven so that they cannot injure the work or the workman and remain idle until selectively or individually positioned for use and engaged against the work.

Another object of this invention is to provide a power tool of the character referred to in which the engagement of the selected drill bit, or the like, with the work, and a suitable operating pressure of the same against the work, automatically clutches the bit chuck with the drive means and the release of such pressure automatically disengages the chuck from the power drive. The mere locating of the selected bit, followed by suitable pressure of the bit against the work is all that is required to put the bit into operation and the release of the feed pressure automatically disengages the blt from the power means of the tool. The operator is not obliged to manipulate latches, threaded parts, bolts, switches, -or the like, in order to position and condition the bits or other implements for operation.

Another object of this invention is to provide a multiple purpose power tool of the character refered to in which the branches or chuck arms of the head form effective grips or handles for facilitating the handling of the power tool and,

the accurate operation of the bits, drills, riveting heads, and the like. v

Another object of this invention is to provide a multiple chuck means or head attachable to or adaptable to power tools and adapted to carry a plurality of drills, bits, countersinks, reamers, and the like, for successive or selective operation, by the tool.

Another object of this invention is to provide a multiple chuck head of the character just mentioned which may be readily applied to the power tool with little or no alteration of either the tool or the head.

A further object of this invention is to providea multiple chuck head attachable to or adaptable to power tools which is small, compact,l light in weight, and inexpensive.

'I'he various objects and features of my invention will be fully understood from the following detailed description of typical preferred forms and applications of my invention, ,throughout which description reference is made to the accompanying drawing, in which:

Fig. 1 is a side elevation of the power tool provided by this invention with broken lines illustrating a second position of the multiple chuck head. Fig. 2 is 'an enlarged, vertical, detailed, sectional view of the head showing one of the chucks in position for use but disengaged from the power drive and showing certain parts in side elevation. Fig. 3 is an enlarged, horizontal, detailed, sectional view taken substantially as indicated by line 3-3 on Fig. 2, and Fig. 4 is a transverse, detailed, sectional view taken as indicated byline 4-4 on Fig. 3.

The present'invention may be said to comprise. generally, a power tool i0 having a driven shaft il, and a head attachable to or mounted on the tool III and comprising a mounting member l2,

--power tools of for clutching the chucks I4 with the driven shaft II.

The power tool I5 may be of any selected or required type and design and of appropriate power rating. The power tool illustrated comprises a housing'or casing I8 which encloses the motor M indicated in outline in Fig. 1. A grip or handle I1 is provided on the rear end of thecasing I3 and a switch (not shown) for controlling the motor M has a handle part I3 on the handle I1 to be engaged by the operators hand grasping the handle. The cable or conductor I9 for carrying the operating electrical energy to the tool may enter the handle I1. A portion of reduced diameter continues forwardly from the casing I6. In the case illustrated this portion 23 is located above the 4longitudinal axis of the tool. The forward part 22 of the reduced portion 20 is further reduced in diameter to provide a forwardly facing annular shoulder 2I. The part 22 is preferably, though not necessarily, cylindrical and may have a flat vertical end as illustrated. The power shaft or driven shaft II of the tool III extends forwardly through the part 22 to project beyond its forward end.

The multiple. head of the invention is applied or secured to the forward end of the tool III and the mounting member I2 is a fitting, adapter or carrier, readily applied tothe tool and serving to support the head thereon. The member I2 may Abe different styles, sizes, etc. In the present case the member I2 is an annular o'r tu- '.bular element fitted over the -above mentioned 22. The member I2 is adapted to be passed part 22 to have its rear end cooperate onto the part with the shoulder 2I and an internal shoulder 23 may be formedin the member I2 to engage rearwardly against the end of the part 22. Clamp screws or set screws 24 are threaded in openings in the member I2 and cooperate with the part 22 to secure or iixy the member I2 to the power tool I0. The opposite sides of the member I2 have flat vertical bearing faces 25 for the purpose to be later described.A

The body I3 of the multiple tool head may vary in design and construction in different applications of the invention. The number of implement holders or chucks I4 employed and the type of the intended work are factors which may determine the shape and construction of the body I3. In the form of the invention illustrated in the drawing the body I3 is designed to carry two implement holders or chucks I 4 and the body is a generally L-shaped member. In practice the body I3 may be integral, it being understood that it may befabricated from two or more sections if desired. The body I3 has two arms or branches A and B joining at a hub which is in the naturevof a yoke 25. The branches A and B are preferably alike Ain size and shape land are elongate'tubular parts having central longitudinal openings 21. The openings 21 are of uniform diameter and extend from the yoke 23 tothe outer ends of the branches. Where the body I3 has two branches A and B, as illustrated,"

varied to adapt it for application to lthe member ,I2 and have their heads turnably received in horizontally aligned openings 3| in the yoke 26. The screws 23 secure the multiple head to the power tool I0 for swinging about an axis transverse of and intersecting the longitutudinal axis of the power shaft II. The space within the yoke 25 receives the member I2 with sulcient clearance to allow substantial swinging of the head body I3. However, the cooperation of the yoke 26 with the faces 25 holds the body I3 against lateral play or movement. Adjustable stop means are provided to limit the swinging of the body I3 and to stop the body in the twn positions where the openings 21 oi' the branches A and B are longitudinally aligned with the axis of the shaft II. Lugs 32 are formed on the inner parts of the branches A and B and adjustable screws 33 are threaded into openings in the lugs. The screws 33 extend inwardly beyond the branches A and B and their heads are cooperable with the mounting member I2 to limit swinging of the body I3. Lock nuts 34 are threaded on the vscrews 33 for setting or securing the screws in their adjusted positions. The head body I3 is swingable through 90 between the position 'A is' aligned with the shaft II and a position where the branch A projects upwardly, as illustrated by the broken lines, and where the branch B is aligned with the shaft II. The stop' screws 33 serve tostop or position the body I3 in these two positions.

The implement holders or chucks I4 are adapted to receive and hold drills, bits, reamers, etc., of different types and may be varied somewhat to receive and hold different forms of such tools or implements. The chucks I4 illustrated in the drawing are suitable for holding straight shanked drills, etc. There is a socket or chuck means I4 provided in each branch-A and B of the head body I3 and the two chucks may be identical or substantially the same. Each chuck I4 includes an elongate tubular member 35 extending 'longitudinally through the opening 21 of its A members 35 have reduced forward portions prothe openings 21 are at 90 to one another. It is preferred t0 form and proportion the branches A and B so that they'constitute eifective grips .or handles. In the case illustrated the branches A and B are generally cylindrical 4and are pro' portioned to rather accurately receive the drills, bits, reamers, etc. The rear portions of the openings 31 are screw threaded to receive screws 33. The drills or tools are inserted in the chuck members 35 and are moved inwardly until they engage against the screws 33. Thus in the case illustrated it may be considered that the drill D arranged in the chuck I4 of the branch A has its inner end against the screw 33 of that chuck and that thecounter-sink C carried by the chuck I4 of the branch B has its' inner end engaged against the screwdl of that chuck. The screws n my be adjusted .or set to determine the depth of cut or extent of action of the drill D and counter-sink C. Set screws 33 maybe threaded through 'openings in the chuck members 35 to The chucks I4 further include carriers 40 shiftable longitudinally in the openings 21 of the branches A and B and serving to carry the members 35. The carriers 4I) slidably bear inthe inner portions of the openings 21 and ave reduced portions slidably engaged in bushings 4I secured in the forward ends of the arms A and B. The chuck members 35 are freely turnablev in the openings 31 of the carriers 40 and extend beyond the opposite ends of the carriers. The heads 36 cooperate with the inner ends of the carriers 40 and collars 42 are secured to the members 35 and cooperate with the forward ends of the carriers. With this construction the members 35 are freely rotatable relative to the carriers 40 but are obliged to move longitudinally with the their respective branches A or vB are aligned with the shaft I I. The clutch means I5 includes cooperating clutch parts on the shaft II and the inner ends of the members 35. In the constructhere must be deliberate action on the part of the workman or user to engage the heads 36 and clutch part 44. With a branch, say the branch A, aligned with the shaftlI and with tion illustrated the heads 36 of ,the members 35 y 36 are bevelled or rounded to facilitate the entrance of the heads 36 into the sleeves 46. y

Yielding means are provided for normally where their heads 36 are out of cooperation with the clutch part 44 and where their heads 36 can-A not interfere with the clutch part or its sleeve 46. 'I'he intermediate portions of the carriers 40 are reduced in diameter and springs 41 surround these reduced portions of the carriers. Annular flanges 43 onvthe reduced portions of the carriers engage the inner ends of the bushings 4| to limit the outward movement of the chucks I4 in v their arms A and B. The outerl ends of the springs 41 bear 'against these flanges 48. One or more keys 49 are fixed in the inner portions of the arms A and B and slidably cooperate with keyways 50 formed in the carriers 40. The keys 49 serve to hold the carriers 40 against rotation so that the carriers form effective bearings or bushings for the rotatable implement carrying members 35. The rear ends of the springs 41 'holding the chucks I4 forward and extended bear on the forward ends of the fixed keys 49.V

The. springs 41 are under compression between the flanges 48 and the keys 49 andlurge the carriers and the members, 35 forwardly or outwardly. The springs 41 are of sufficient strength to normally hold the chucks I4 in positions where their heads 36 are entirely clear of the clutch part 44 and where they will not engage the sleeve 46. The'springs 41 are of such -strength that the drill D engaged against the'work, pressure on the tool I 0 toward the work will overcome the spring 41 in the branch A so that the clutch part 44 is moved forwardly into cooperation withalthe head 33. This results in the engagement of the tongue in the slot 43 so that the member 35 and its drill D may be driven by the power tool IIL It is believed that the operation of the tool will be understood from the foregoing detailed description. The multiple head and its carrying member I2 may be constructed as original parts of the power tool I0 or may constitute an attachment or appliance for use on a previously constructed power tool. In the latter Acase the mounting member I2 is merely arranged on the part 22 of the power tool and is fixed thereto by the screws 24. The head body I3 is readily secured to the mounting member I2 by the screws,

u means of the screws 38 and then secured in the adjusted positions. With the required or selected drills or other implements fixed in the chucks I4 the'tool is in condition for use. In the case illustrated where the arm or branch A carries the drill D Aandthe branch B carries the coun ter-sink C the drill is employed to form a'n open-- ing and the counter-sink C is then used to counter-sink the opening thus formed. For the first operation the head body I3 is brought to the position illustrated in full lines in Fig. 1 to align the branch A with the shaft II. The `drill D is engaged against the work and a forward pressure is applied to the power tool I0 to overcome the spring 41 and engage the clutch part 44 with the head 36. The shaft II driven by the motor of the power tool I0 drives the chuck member 36 to operate the drill D. During the drilling of the opening the operator may graspA the handle I1 with one hand and may grasp the branch B with the other hand to support the tool and to .maintain the head body I3 in the position where the stop screw 33 on the branch B tightly bears against the member I2. It will be observed that the branch B forms an eective handle when the drill carried by the branch A is in use.

For the ycounter-sinking operation the head body I3 is swung to the position where the branch A projects upwardly as indicated in broken lines in Fig. 1 and where the branch B is aligned with the shaft A. The stop screw 33 of the branch A serves to stop or locate the body I3 in this position. 'I'he operator may grasp the handle I1 and the upstanding branch A to support and manipulate the tool.' The countersink C is engaged inthe previously bored opening and a forward pressure is put on the power tool I0 to engage the clutch part 44 with the headv4 36 of the chuck I4 in the branch B. The power driven shaft H is thus coup1ed with the countersink CU to operate the same. 'Ihe multiple head body I3 is very easily and quickly swung between its two operative positions and its branches A and B form effective grips or handles facilitating the use of the tool. The multiple head is light in weight and compact, and does not disturb the balance of the tool.

1 sitions.

Having ldescribed only a typical preferred form and application of my invention; I do not wish to be limited or restricted to the specific details scope of the following claims:

Having described my invention. I claim:

l. In combination; a power tool including a tool body, handle means on the tool body for supporting and manipulating the tool, a motor carried by the tool body, and a shaft driven by the motor; and a multiple head for the tooicom.. prising a head body. a plurality of implement chucks on the head body, means for supporting the head body on the tool body f'or movement between positions where the chucks are individually conditioned for operation by the shaft, abutments on said means, parts on the head body engageable with the abutments to stop the head body in said Positions and freely disengageable from the abutments when the headbody is to be moved from one position to the other, and clutchl means for clutching the chucks with the shaft.

2. In combination; a power tool including a tool body, handle means on the tool body for supporting and manipulating the tool; a motor carried by the tool body, and a shaft driven bythe motor; and a multiple head for the tool comprising a head body, a plurality of spaced chucks shiftably carried by the head body, curing the head body to the power tool for movement so that the head body may be moved to selectively align the chucks with the shaft, means for clutching the chucks with the shaft upon relative movement -between the chucks and head body, and means yieldingly resisting such relative movement between the chucks and head means for stopping swinging movement of the,

head body in positions where the chucks are aligned with the shaft, means for clutching the* chucks with the shaft upon relative movement between the chucks when'the head is in said poand spring means for yieldingly holding the chucks where they are de-clutched Afrom the t. 4. A-'po`wer tool includinga motor casing, a

. motor driven shaft extending from the casing, a

mounting memberl secured to the casing, a headA -body comprising a yoke and branches diver-ging from the yoke, means for pivotally. mounting' the yoke on the member ,so that the head body may be swung to positions where the branches are aligned with the shaft, chucks shiftably carried by the branches, and means operative upon relative shifting of the head body and chucks with the head body in said positions for clutching the chucks with the shaft. 5. A power tool including a motor casing, a

motor driven shaft extending from the casing, a mounting member secured to the casing, ahead body comprising a yoke and'branches diverging from the yoke, means supporting the yoke on saidmembersothatthebodymaybeswungtc meansfor seasoascs positions to alignthe branches with the shaft. and shiftable spring held chucks carried by the branches and conditioned for driving by the shaft upon relative shifting between the head body and 'the chucks with 'the chucks aligned with the shaft.

6. A power, tool including a motor casing, a motor driven shaft extending from the casing. a mounting member secured to the casing, a head body comprising a yoke and branches diverging from the yoke, means supporting the yoke on said member so that the body may be swung to positions to align the branches with the shaft. shifttable carriers in the branches, chucks rotatably carried by the carriers, and cooperable clutch parts' on the shaft and chucks engageable upon relativ'e shifting between the head body and carriers with the chucks aligned with the shaft.

7. A power tool including a motor casing, a motor driven shaft extending from the casing, a mounting member'secured to the casing. s head body comprising a yoke and branches dlverging from the yoke, means supporting the yoke on said member so that the body may be swung to positions to align the branches with the shaft, shiftable carriers in the branches, chucks rotatably carried by the carriers, cooperable clutch parts on the shaft and chucks engageable upon relative shifting between the head body and carriers with the chucks aligned with the shaft, and spring means yieldingly holding the chucks in positions where their clutch parts are retracted clear of the clutch part on the shaft. i

8. A power tool including a motor casing, a motor driven shaft extending from the casing, a mounting member secured to the casing, a head body comprising a yoke and branches diverging from the yoke, means supporting the yoke on said member so that the body may be swung to posi- -comprising a. head body tions to align the branches with the shaft, shiftable'carrirs in thefbranches, chucks rotatably carried by vthe carriers, the chucks including means for .adjusting the setting of their respective tools, and cooperable clutch parts on the shaft and chucks engageable upon relative shifting between the head body and carriers with the chucks aligned with the shaft.

Q 9. A head for use on a power tool having a.

casing and a driven shaft extending therefrom l having divergent branches, means for mounting the body on the tool casing for vswinging movement to selectively l align the branches with the shaft, shiftable rotatable chucks in the branches. cooperable clutch parts on the shaft and chucks engageable to drive the chucks when the branches are'aligned with the shaft, and spring means yieldingly holdingthe chucks in positions where their clutch parts are clear of the part on the shaft.

l0. A'head for use on a power tool' having a casing and a driven shaft extending therefrom comprising a head body having divergent branches, means for mounting the body fon the tool casing for swinging movement to selectively align the branches with the shaft, shiftable rotatable chucks in the branches, cooperable clutch parts on the shaft and chucks engageable to drive the chucks when the branches are aligned with the shaft. a guide on the clutch part of the shaft for guiding the clutch parts of the chucks'into cooperation therewith, and spring means yieldingly holding the chucks in positions where their 

